SInce the PSP doesn't have an individual offline user account system, it can't tie more than one system to a PSN account. You've got to delete your old account from that PSP and re-do the process using your JP account this time. This means any PSN or PSX games you have saved on your PSP won't be playable. Which is alright, because you can always switch accounts again and simply re-download them. Or download them to your PS3 and copy them. The latter is actually much faster, and reliable. I'd reccomend Deactivating your PSP for both Games and Videos before doing so.
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